Naoko had an ideal marriage with a kind man. However, somewhere in Kokoro, she may have been longing for excitement. Her husband's boss read Naoko's Kokoro. He wanted an obedient sex slave to satisfy his overflowing sexual desire. Using his position, Oki visited the house while one of his subordinates was at work, and thrust his penis, which was so swollen that the veins popped out, into Naoko, who he had had his eye on for some time. Naoko resisted, but she was so sensitive that she orgasmed, so he fed her "pleasure" as a bait and gradually dominated her...